Waterbuck were housed with Giraffe in the early 80s. Towards the late 80s and into the 90s, the sable antelopes were housed with the giraffes. On completion of the current giraffe house, the dama gazelles were moved from their old yards (now housing the anoa in the gibbon exhibit) to mix with the giraffes. The congo buffalo were previously always housed in the area recently occupied by the sable antelope herd....I assume it was a basic swap once the 'heart of africa' house was completed.
I wonder what prompted the move, Sable antelope are highly strung and it will be interesting to see how they react to the visitor access to their indoor stalls. Do you know where the dama gazelles have been moved to?